diff --git a/src/meshlabplugins/filter_isoparametrization/iso_parametrization.h b/src/meshlabplugins/filter_isoparametrization/iso_parametrization.h
index 2ca09ef8e..a64e152e5 100644
--- a/src/meshlabplugins/filter_isoparametrization/iso_parametrization.h
+++ b/src/meshlabplugins/filter_isoparametrization/iso_parametrization.h
@@ -90,7 +90,7 @@ public:
     }
 
 	CoordType RPos;
-	static const bool Has_Auxiliary(){return false;}
+  static bool Has_Auxiliary(){return false;}
 };
 
 class ParamFace: public vcg::Face <  ParamUsedTypes,
diff --git a/src/meshlabplugins/filter_isoparametrization/opt_patch.h b/src/meshlabplugins/filter_isoparametrization/opt_patch.h
index b0147cef0..8d47ce8fc 100644
--- a/src/meshlabplugins/filter_isoparametrization/opt_patch.h
+++ b/src/meshlabplugins/filter_isoparametrization/opt_patch.h
@@ -364,7 +364,7 @@ public:
 		delete(p);
 	}
 
-	typedef struct Elem
+  struct Elem
 	{
 	public:
 		VertexType *center;
@@ -372,7 +372,7 @@ public:
 		int t_mark;
 
 		//bool operator <(Elem* e){return (priority<e.priority);}
-		inline const bool operator <(const Elem& e) const 
+    inline bool operator <(const Elem& e) const
 		{ 
 			return (priority<e.priority);
 			//return (locModPtr->Priority() < h.locModPtr->Priority());
@@ -385,6 +385,7 @@ public:
 			t_mark=_t_mark;
 		}
 	};
+
 	std::vector<Elem> Operations;
 
 
diff --git a/src/meshlabplugins/filter_isoparametrization/param_mesh.h b/src/meshlabplugins/filter_isoparametrization/param_mesh.h
index 9dca773f5..cfa3aace1 100644
--- a/src/meshlabplugins/filter_isoparametrization/param_mesh.h
+++ b/src/meshlabplugins/filter_isoparametrization/param_mesh.h
@@ -41,7 +41,7 @@ public:
 		//num_collapse=1;
 	}
 	
-	static const bool Has_Auxiliary(){return true;}
+  static bool Has_Auxiliary(){return true;}
 
 	vcg::Point2<ScalarType> RestUV;